This was an intentional change to address feedback from customers who need Lightroom to be more responsive while an export is in progress. It is a tradeoff - use more CPU and make exports fast, or use less CPU and make Lightroom more responsive. We feel the current CPU usage is an appropriate middle ground between the two extremes.

One note - if you kick off multiple simultaneous export sessions, that will use more CPU (each session takes an additional chunk).

Hmmm. Ridiculous. I'm in the largest LR-Facebook-Community in Germany and noone else reported that problem. Several people wrote, that Export is nailed around 100% on their machines. Some people wrote, that the Export is the fastest ever. Hmmm. My logic says me, that cannot be a priority adjustment of the CPU-Power.

I don't know the Source-Code of LR and all the modules, but with my knowledge it should be a very easy thing to let the User chose by himself about that priority. In General Preferences. As well as a live switch on the Main-GUI. Let them chose the feeling they want. Name it "The Experience switch". :)

Hey, i have a really nice computer and LR is ugly SLOW. When exporting i don't want to work further on my pictures. Exporting normally means: I'm ready with the editing, give me the pictures. i'm waiting to copy them to the USB-Stick for my clients.

Are you kidding me? That's not a tradeoff, LR was still pretty responsive while exporting at ~100% and I'm pretty sure that exporting ist the last step in the pipeline for the majority of all users. At the very least give us the option to choose the behavior ourselves. It just took me 20 min. to export 400 photos instead of probably 7 or so. My clients are waiting, i can't continue to work. This is an absolute no go!

I guess there's a reason why all my colleagues start switching to capture one. I never used to have any major issues wit LR, but in the past months it started stacking up, first i had some random white images while exporting, which was resolved finally after a couple of months...then you crippled the import dialogue, which you reverted thankfully, so please do the sensible thing and give us back our cpu power to get some work done.

I appreciate all the work you do, but get it together guys, seriously!

When exporting many pictures at a time I see LR is not using all my CPU power (about 20-50% MAX). It seems to export in batches of 4 images at a time, I would really like to be able to change this to 8 or even 16 images processed at any given moment instead of the low number of 4 in settings somewhere.

Kicking off multiple export didn't help at all. I am just exporting 4 sets of 160 some pics, a total of 653 pics. Total CPU usage is low. Also CPU clock speed isn't at max either...Performance is constantly low, multiple exports doesn't offer any additional benefit.

Just as an update from here: LR CC 2015.4 and nothing has changed. This Version is the slowest i know. In 2015.1.1 everything was fine. Please have a look at my very first post. Have a look at the time i stopped.

This is getting embarrassing, I use Lightroom everyday and I have almost no hair left on the head it is soooo slow, anything it does is slow now, changing between Library and Develop is slow, working on the pictures is slow, exporting is extremely slow. I cant change back to older version as my catalog will not open.

I feel the pain of those who are seeing such slow exports and apparent lack of resource use.One of my clients is a school photography business, they use LR to import and cull all the images followed by exporting both a hi-res and lo-res version - we can be talking about anything from 1000-7000 shots per day over 8 Macs once all the shooters get back to base.No matter how much hardware they throw at this, the export times are still very slow compared to what they could be if the hardware was used to its maximum. Doing the export in multiple small batches does speed up the export but this is a real pain with high volume work as there's always the chance that an image may be missed when selecting the next groups - this is a high pressure environment not a test lab that we're talking about here!I certainly think that, as others have mentioned, there should be an option to balance the load depending on the users workflow requirements - not sure how you could do it but it would make you a lot of friends! ;)

Why would you even limit your application to 50% CPU usage? I mean like for example if you were hungry, went out to get a burger at your favorite burger place, paid for it and then get only served half a burger, when you used to get a whole burger before...what would your reaction be? Do we need to file a class action lawsuit or something to get you to fix this issue? This is a significant problem for people who export more than a dozen photos...

A damn configuration option is not that hard to implement. I have a 6 core maschine and Lightroom should use the hardware for something useful!

The current memory leak in CC 2015.6 is a nightmare and the work to do to downgrade to the last functional release is painful as well.

Please Adobe: Fix the bugs that there introduced in the last releases and work HARD on the performance.The possible integration between the Adobe eco system are good but they are useless if the basic requirements are failing.